“ok but a big part of digestion is bacterial too and the undigestable parts are fermented by bacteria and produce beneficial effects in MANY ways which science has documented”
True, most humans do have a microbiome that breaks down undigested food products further, but since bacteria aren’t human, nor part of a human, they are not, by definition, part of “human digestion.” You basically state this in the quote, by talking about bacteria fermenting “undigestible parts” of food. Some humans don’t have any gut bacteria, with David Vetter being a prime example. Some humans on long term antibiotic regimens are thought to have germ free digestive tracts as well. So gut bacteria aren’t strictly necessary for human life.
While some bacteria may have some positive effects on the gut, and some may make beneficial compounds, they can also make some very negative compounds for human health. The prime examples are endotoxin, lactic acid, and serotonin. Again, this is one of Peat’s core principles that you should at least be familiar with, since you are on a forum that is primarily focused on discussing and implementing his work and ideas. There’s even the extreme case of “Auto-Brewery Syndrome,” where people have gut bacteria that make enough alcohol from carbohydrates to become drunk. As such, eating a diet that largely bypasses human digestion and relies heavily on fermentation by bacteria may not be the best idea.
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